[GitHub] [doris] gnehil commented on pull request #18438: [fix](es) ClassCastException when getting root schema

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gnehil commented on PR #18438:
URL: https://github.com/apache/doris/pull/18438#issuecomment-1501042570

   I think we are not having the same problem.
   The problem I have encountered is that when calling the `getRootSchema` 
method, when the `mappingType` is null and there is `dynamic` parameter in the 
mapping json, since the first element obtained by traversing the mapping json 
through the iterator is `dynamic`, and its type is `TextNode`, a 
`ClassCastException` will appear when running the following code：
   ```java
   ObjectNode firstData = (ObjectNode) mappings.get(firstType);
   ```
   All this happens before calling the `replaceFieldAlias` method.


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